ex0724: Crab Claw Size and Force

Description Usage Format Source References Examples

Description

As part of a study of the effects of predatory intertidal crab species on snail populations, researchers measured the mean closing forces and the propdus heights of the claws on several crabs of three species.

Usage

1

Format

A data frame with 38 observations on the following 3 variables.

Force

closing strength of claw of the crab

Height

propodus height of claw of the crab

Species

species to which the crab belongs

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

Yamada, S.B. and Boulding, E.G. (1992). Shell–breaking Efficiency of Predatory Crabs Influences the Distribution of an Intertidal Snail, Technical Report, Zoology Department, Oregon State University.

Examples

1

Example output

'data.frame':	38 obs. of  3 variables:
 $ Force  : num  3.2 6.4 2 2 4.9 ...
 $ Height : num  5 6 6.4 6.5 6.6 ...
 $ Species: Factor w/ 3 levels "Cancer productus",..: 2 2 2 2 2 2 2 2 2 2 ...

Sleuth2 documentation built on May 30, 2017, 6:21 a.m.